Someone recently told me (I don't know for sure myself) that all of the commercial J2EE app server vendors (e.g. IBM WebSphere, BEA Weblogic, Sun iPlanet, Macromedia JRun, but NOT JBOSS...) require you to sign a license, before even downloading their product, which prohibits you from publicly disclosing any speed or comparison results. That's why you can't find any!